| 摘要 |
PURPOSE:To increase the adhesive strength of a polyester film to a hydrophilic colloidal layer by coating the film with an underlayer of a mixture of a high molecular aq. dispersant with a water soluble polymer and a specified polyethylene oxide compd. CONSTITUTION:One side of a polyester film as a photographic support is coated with an underlayer or a mixture of a high molecular aq. dispersant with a water soluble polymer and a polyethylene oxide compd. represented by the formula [where each of R1 and R2 is a hydrocarbon group and (n+m)=0-30]. Styrene-butadiene latex or methyl methacrylate-butadiene latex may be used as the high molecular aq. dispersant and gelatin or PVA as the water soluble polymer. Since the compd. represented by the formula is added the adhesive strength of the photographic support to a covering substance is increased and the transparency can be improved. |
